Is Your Gmt-900 Truck Or Suv Using Oil

frankycjr · December 20, 2012

RyanbabZ71,

According to the Service Manager my intermittent hesitation could be form the PCV valve getting oil into it. I don't know if I buy that yet, but I need to be able to get them to reproduce the issue which is a bit tough on this one.

It was just one of the things I needed to have looked at by my dealer. Overall I love the truck, but really think my gas milage is a bit low. I had a 1999 silverado Extended cab with the 5.3 and 4 speed tranny and 3.71 rear and even with 200000+ miles was still getting around 16mpg. My only complaint about the 1999 was the Tranny, which blew at 213k and that the extended cab became a bit small for my 2 kids in the back.

I keep thinking that if I swapped out my 20" rims and the 275/50/r20 tires with a set of 17" rims and 255/75/r17 tires that I would get much better mpg, but I have nothing to prove it one way or the other. I will probably get a pair of Aluminum 17" rims this summer off of Ebay as I do prefer the look of those rims better than my 20" rims.

Thanks

Frank

frankycjr · December 20, 2012

Got my truck back from the dealer to start consumption test. At dealership I checked oil and it was way past hash mark, they took it in and gave it back saying it was all set. It's been sitting in my driveway for a few hours now. My driveway is not quite level so the nose is slightly higher than back. In checking the oil again it is still about a quart past hash mark. So I'm going to take a picture with my cell shortly and contact the Service Manager. Seems like GM is trying to prevent having to do a full workover of the vehicle.

Frank

GMCustomerService · December 20, 2012

frankycjr,

Keep me posted on your progress. Let me know if you need any additional assistance. Thank you.

Tricia, GM Customer Service.

JaBradt85 · December 20, 2012

I used 1 full quart of Mobil 1 5w30 in 3000 miles, I usually change it around 3-3500 miles. Mixed city and highway and Im getting 14.8-15 mpg on the DIC, winter blend gas is terrible.

f0st3r · December 29, 2012

My 08 still is problem free at 80k, I have been changing my own oil for the last year and kept a close eye on it. At most, it was 1/2 quart low. Just using plain old Pennzoil 5-30.

hillbilly4u · December 31, 2012

Update: Just hit 1000 miles since the piston/ring job. Oil is right where it was when I picked the truck up.Full. It is also a clean honey color still. Before the job it was dirty after 500 miles at oil change. So far so good.

hillbilly4u · December 31, 2012

Got my truck back from the dealer to start consumption test. At dealership I checked oil and it was way past hash mark, they took it in and gave it back saying it was all set. It's been sitting in my driveway for a few hours now. My driveway is not quite level so the nose is slightly higher than back. In checking the oil again it is still about a quart past hash mark. So I'm going to take a picture with my cell shortly and contact the Service Manager. Seems like GM is trying to prevent having to do a full workover of the vehicle.

Frank

Frank. Take it back in and have them remove the excess oil or your consumption test will be wrong.I had the same problem with first test.Manual says 6qts but it don't hold that much.

tanked_darren · December 31, 2012

Got my truck back from the dealer to start consumption test. At dealership I checked oil and it was way past hash mark, they took it in and gave it back saying it was all set. It's been sitting in my driveway for a few hours now. My driveway is not quite level so the nose is slightly higher than back. In checking the oil again it is still about a quart past hash mark. So I'm going to take a picture with my cell shortly and contact the Service Manager. Seems like GM is trying to prevent having to do a full workover of the vehicle.

Frank

Awesome be sure to let us know what happens! People laugh when I used to go to the dealer for service. I check the oil and check my valve caps. Why? Because they lose or unscrew them so why should I trust they put oil in it?

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frankycjr · January 5, 2013

Finally got some time to get to the dealership and we have adjusted the oil level so that it is now right at the top of the cross hatch and also covering the top dimple. We now have a known good baseline to start the oil consumption test.

Now we'll see if the truck continues to use oil at the same rate as before.

FL_Silverado08 · January 7, 2013

UPDATE: New piston and rings at 86K......Now at 94K and has used 4 qts......Wondering if I should take it back to see if they will do anything else??

Started drinking down the oil again....at 102k notice down about 2 qts after a 700 mile trip in November...Just drove 2000 miles over the holidays and I am now at the bottom of the stick..Don't know what say or do next?

GMCustomerService · January 7, 2013

FL_Silverado08,

I would have to recommend taking the vehicle back to the dealer for more assistance. Please keep me posted and do not hesitate to reach out if you need anything.

Tricia, GM Customer Service.

Robert1 · January 14, 2013

Has anyone on here brought in a 6.2L engine for oil consumption problems? If so how many miles were on it and what year model?

jloutz · January 19, 2013

2007 Tahoe with 50,000 miles and it has been using oil for the last 6000 miles. Recently it blows quite a bit of smoke at start up, so I took it to the dealer and they diagnosed the AFM pressure release valve under TSB #10-06-01-008 and $1500 to do the work. What does anyone suggest?

arz71 · January 20, 2013

I have a 2009 Silverado 5.3 AFM non-flex fuel engine - with 27,000 miles on it. I believe it has an iron block (what code is the aluminum block), I have not check the oil nor kept an eye on consumption. Is it by the vin number?

Is this across the board on iron or aluminum block?

Is the defect the piston/rings but the bore is true/straight correct ?

I am going to start monitoring mine, since it is now 4 years old and the warranty only goes for 5 years/100,000 miles on the PT right?

Edited January 20, 2013 by arz71

Black2011 · January 24, 2013

I don't know if I would trust this.. What about oil in the filter? Through out the engine? I'd go by before and after on the dip stick.

hot oil VS cold oil, filter, settling time etc, all factors. Engines should be drained hot. This ensures all the contaminents your oil is designed to absorb come out when you drain it, and leave it drain for at least 15 minutes. The oil should be full when hot and no lower then 1/2 way down the operational area of your dipstick when cold. Like others have mentioned, Collect drained oil and compare with oil added. Id say any oil consumption is unacceptable from a new truck.